Europyo

Gikan sa Wikipedia, ang gawasnong ensiklopedya
Europium
63Eu
-

Eu

Am
samariumeuropiumgadolinium
Appearance
silvery white, but rarely seen without oxide discoloration
General properties
Name, simbolo, kaiphan europium, Eu, 63
Pronunciation Plantilya:IPAc-en
Plantilya:Respell
Element category puthaw nga lantanido
Group, period, block [[group {{{group}}} element|{{{group}}}]], 6, f
Standard atomic weight 151.964
Electron configuration [Xe] 4f7 6s2
2, 8, 18, 25, 8, 2
Electron shells of europium (2, 8, 18, 25, 8, 2)
History
Discovery Eugène-Anatole Demarçay (1896)
First isolation Eugène-Anatole Demarçay (1901)
Physical properties
Phase magahi
Density (near r.t.) 5.264 g·cm−3
Liquid density at m.p. 5.13 g·cm−3
Melting point 1099 K, 826 °C, 1519 °F
Boiling point 1802 K, 1529 °C, 2784 °F
Heat of fusion 9.21 kJ·mol−1
Heat of vaporization 176 kJ·mol−1
Molar heat capacity 27.66 J·mol−1·K−1
Vapor pressure
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 863 957 1072 1234 1452 1796
Atomic properties
Oxidation states 3, 2, 1

(mildly basic oxide)

Electronegativity  ? 1.2 (Pauling scale)
Ionization energies 1st: 547.1 kJ·mol−1
2nd: 1085 kJ·mol−1
3rd: 2404 kJ·mol−1
Atomic radius 180 pm
Covalent radius 198±6 pm
Miscellanea
Crystal structure body-centered cubic
Europium has a body-centered cubic crystal structure
Magnetic ordering paramagnetic[1]
Electrical resistivity (r.t.) (poly) 0.900 µΩ·m
Thermal conductivity est. 13.9 W·m−1·K−1
Thermal expansion (r.t.) (poly)
35.0 µm/(m·K)
Young's modulus 18.2 GPa
Shear modulus 7.9 GPa
Bulk modulus 8.3 GPa
Poisson ratio 0.152
Vickers hardness 167 MPa
CAS registry number 7440-53-1
Most stable isotopes
Main article: Isotopes of europium
iso NA half-life DM DE (MeV) DP
150Eu syn 36.9 y ε 2.261 150Sm
151Eu 47.8% 5×1018 y α 1.9644 147Pm
152Eu syn 13.516 y ε 1.874 152Sm
β 1.819 152Gd
153Eu 52.2% 153Eu is stable with 90 neutrons
t  h  u
· r

Ang europyo (Iningles europium) mao ang elementong kimiko sa talaang peryodiko nga may simbolo nga Eu ug kaiphan nga atomik 63. Ang europyo mao ang puthaw nga lantanido.

Ang mga gi basihan niini[usba | edit source]

  1. Magnetic susceptibility of the elements and inorganic compounds, in Lide, D. R., ed. (2005). CRC Handbook of Chemistry and Physics (86th ed.). Boca Raton (FL): CRC Press. ISBN 0-8493-0486-5. 


Galeriya sa hulagway[usba | edit source]